Boris Savinkov
Boris Viktorovich Savinkov (Russian: Борис Викторович Савинков; 31 January 1879 – 7 May 1925) was a Russian revolutionary, writer, and politician. As a leading figure in the Socialist Revolutionary Party's (SR) Combat Organization, he was a key organizer of high-profile assassinations of tsarist officials, including that of Interior Minister Vyacheslav von Plehve in 1904 and Grand Duke Sergei Alexandrovich in 1905.